Figure 4. A 22-year-old female presented with pyrexia and pleuritic chest pain. (a) T₁ and (b) T₂ weighted axial spin echo images show thickened pericardium (arrows). The T₂ signal of the pericardium is high, suggesting active inflammation. The patient also had a pericardial effusion (E). Intermediate signal of this fluid on T₁ suggests that it is proteinaceous.